---
id: CVE-2026-115321
title: Bytebase before 3.16.0 Authorization Bypass via UpdateIssueComment
summary: >-
  Bytebase before 3.16.0 contains an authorization bypass vulnerability in the
  UpdateIssueComment handler that allows low-privileged project users to modify
  comments in other projects by supplying a foreign comment UID. Attackers with
  any …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: bytebase
product: bytebase
affected:
  - bytebase < 3.16.0
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T10:57:40.982Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115321'
references:
  - url: 'https://github.com/bytebase/bytebase/issues/19369'
  - url: 'https://github.com/bytebase/bytebase/pull/19552'
  - url: >-
      https://github.com/bytebase/bytebase/commit/270e25529731b59988b58f4a4b3bda431c748bc9
  - url: 'https://github.com/bytebase/bytebase/releases/tag/3.16.0'
    label: 3.16.0 Release Notes
  - url: >-
      https://github.com/bytebase/bytebase/blob/3.15.1/backend/api/v1/issue_service.go#L1116
  - url: 'https://github.com/bytebase/bytebase'
  - url: >-
      https://www.vulncheck.com/advisories/bytebase-before-3.16.0-authorization-bypass-via-updateissuecomment
    label: >-
      VulnCheck Advisory: Bytebase before 3.16.0 Authorization Bypass via
      UpdateIssueComment
tags:
  - cve.org
ingestedAt: '2026-10-22T11:37:02.336Z'
---

## Overview

Bytebase before 3.16.0 contains an authorization bypass vulnerability in the UpdateIssueComment handler that allows low-privileged project users to modify comments in other projects by supplying a foreign comment UID. Attackers with any project role, including Project Viewer, can set their own project's issue as parent and reference another project's comment UID to overwrite comments they cannot access.

## Affected

- `bytebase < 3.16.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.